Vanna White & Niko Santo Pietro/Conan O'Brien/Guy Fieri/Joan Lunden

Good Morning America – Season 51

"Wheel of Fortune" star Vanna White and her son, Niko Santo Pietro, discuss the game show and their social media fame; Oscars host Conan O'Brien; chef Guy Fieri discusses "Tournament of Champions"; golfer Gary Woodland; Joan Lunden